Hey everyone! I built my PC around 9 months ago and it was running smoothly until I installed a vertical GPU mount to prevent my 7900XTX from sagging. I also moved the AIO radiator from the side intake to the top exhaust. During the process, I removed the AIO pump from the CPU, cleaned it, and reapplied thermal paste. Plus, I added three fans at the bottom of my case (NZXT H9).
I used the NZXT GPU vertical mount with a PCIe 4.0 riser cable. There's a slight bend in the riser where it connects to the motherboard, but it seems minor. Now I'm experiencing performance issues in some games, particularly poor 1% lows.
Here are some examples:
- Cities Skylines: Dropped from 160fps to 80fps with frequent dips to 40fps.
- Hell Let Loose: Went from 160fps to 140fps, with 1% lows dropping to 30fps.
- Flight Sim 2020: From 160fps to 90fps, but no drops.
I ran GPU-Z during render tests and it shows the Bus Interface as PCIe x16 4.0 @ x16 4.0. Does anyone know what's causing these issues? Here's my build for context:
- CPU: 7800X3D
- GPU: 7900XTX (XFX 310 MERC)
- PSU: MSI 650
- RAM: 32GB CORSAIR VENGEANCE 5600MHZ CL36
- Case: NZXT H9 FLOW
I realize my setup is overkill for the games I play, but I was planning to build a flight sim rig that didn't pan out. After removing the vertical GPU mount, the problem persists, although it seems slightly better. I'm really puzzled here!
4 Answers
Have you tried running some benchmarks after reverting your GPU back to its original position? That will give you a clearer picture of whether the vertical mount was the problem or if something else is going on.
I suggest checking the PCIe settings in your BIOS. Go to the Advanced or Chipset settings and adjust the speed for your GPU. It’s typically set to auto—changing it to PCIe Gen 4 could potentially fix the performance dips.
Sounds frustrating! I'm glad to hear removing the mount has helped, even if it's not a full fix. Keep experimenting with settings; you might stumble on the real issue!
I've noticed a few riser cables can be problematic. It’s definitely a possibility that yours might not be working well. You might want to consider switching back to the standard mounting to test if that resolves your issue before making any other changes.
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